Microsoft Office has identified a potential security concern

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Method 1: Manually update the links

To manually update the links in the workbook, follow these steps:
  1. With the workbook open, click the Data tab.
  2. In the Connections group, click Edit Links.
  3. Click the link that you want to update, and then click Update Values.
  4. Click Close to close the Edit Links dialog box.

Method 2: Set the links to update automatically

If you receive the security warning message that is mentioned in the "Symptoms" section, follow these steps:
  1. In the security warning message, click Options.
  2. Click Enable this content, and then click OK.

Method 3: Change the startup prompt for the workbook

To change the startup prompt for the workbook, follow these steps:
  1. With the workbook open, click the Data tab.
  2. In the Connections group, click Edit Links.
  3. Click Startup Prompt.
  4. Click Let users choose to display the alert or not, and then click OK.
  5. Click Close to close the Edit Links dialog box.

Method 4: Enable the automatic update for data connections or workbook links in the Trust Center

To enable the automatic update for data connections or workbook links in the External Content section of the Trust Center, follow these steps:
  1. Click the Microsoft Office Button, and then click Excel Options.
  2. Click Trust Center.
  3. Click Trust Center Settings.
  4. Click External Content.
  5. Click to select the following options, as appropriate for your situation:
    • Prompt user about Data Connections
    • Prompt user on automatic update for Workbook Links

  1. Click OK to close the Trust Center dialog box.
  2. Click OK to close the Excel Options dialog box.

*Note: After fixing this the document may open as just a grey screen in Excel. If so go here for the fix: Excel documents open as blank-grey